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US8314245B2 - Preparation of functionalized zeolitic frameworks - Google Patents

Preparation of functionalized zeolitic frameworks Download PDF

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US8314245B2
US8314245B2 US11/680,386 US68038607A US8314245B2 US 8314245 B2 US8314245 B2 US 8314245B2 US 68038607 A US68038607 A US 68038607A US 8314245 B2 US8314245 B2 US 8314245B2
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zif
framework
pore
pores
data
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US20070202038A1 (en
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Omar M. Yaghi
Hideki Hayashi
Rahul Banerjee
Kyo Sung Park
Bo Wang
Adrien P. Cote
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University of Michigan System
University of California San Diego UCSD
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    • B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
    • B01J20/22—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising organic material
    • B01J20/223—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising organic material containing metals, e.g. organo-metallic compounds, coordination complexes
    • B01J20/226—Coordination polymers, e.g. metal-organic frameworks [MOF], zeolitic imidazolate frameworks [ZIF]
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    • B01J31/16—Catalysts comprising hydrides, coordination complexes or organic compounds containing coordination complexes
    • B01J31/1691—Coordination polymers, e.g. metal-organic frameworks [MOF]
    • B—PERFORMING OPERATIONS; TRANSPORTING
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    • B01J31/16—Catalysts comprising hydrides, coordination complexes or organic compounds containing coordination complexes
    • B01J31/18—Catalysts comprising hydrides, coordination complexes or organic compounds containing coordination complexes containing nitrogen, phosphorus, arsenic or antimony as complexing atoms, e.g. in pyridine ligands, or in resonance therewith, e.g. in isocyanide ligands C=N-R or as complexed central atoms
    • B01J31/1805—Catalysts comprising hydrides, coordination complexes or organic compounds containing coordination complexes containing nitrogen, phosphorus, arsenic or antimony as complexing atoms, e.g. in pyridine ligands, or in resonance therewith, e.g. in isocyanide ligands C=N-R or as complexed central atoms the ligands containing nitrogen
    • B01J31/181—Cyclic ligands, including e.g. non-condensed polycyclic ligands, comprising at least one complexing nitrogen atom as ring member, e.g. pyridine
    • B01J31/1815—Cyclic ligands, including e.g. non-condensed polycyclic ligands, comprising at least one complexing nitrogen atom as ring member, e.g. pyridine with more than one complexing nitrogen atom, e.g. bipyridyl, 2-aminopyridine
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    • B01J31/16—Catalysts comprising hydrides, coordination complexes or organic compounds containing coordination complexes
    • B01J31/18—Catalysts comprising hydrides, coordination complexes or organic compounds containing coordination complexes containing nitrogen, phosphorus, arsenic or antimony as complexing atoms, e.g. in pyridine ligands, or in resonance therewith, e.g. in isocyanide ligands C=N-R or as complexed central atoms
    • B01J31/1805—Catalysts comprising hydrides, coordination complexes or organic compounds containing coordination complexes containing nitrogen, phosphorus, arsenic or antimony as complexing atoms, e.g. in pyridine ligands, or in resonance therewith, e.g. in isocyanide ligands C=N-R or as complexed central atoms the ligands containing nitrogen
    • B01J31/181—Cyclic ligands, including e.g. non-condensed polycyclic ligands, comprising at least one complexing nitrogen atom as ring member, e.g. pyridine
    • B01J31/1825—Ligands comprising condensed ring systems, e.g. acridine, carbazole
    • B01J31/183—Ligands comprising condensed ring systems, e.g. acridine, carbazole with more than one complexing nitrogen atom, e.g. phenanthroline
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    • C01B39/00—Compounds having molecular sieve and base-exchange properties, e.g. crystalline zeolites; Their preparation; After-treatment, e.g. ion-exchange or dealumination
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    • C01B39/00—Compounds having molecular sieve and base-exchange properties, e.g. crystalline zeolites; Their preparation; After-treatment, e.g. ion-exchange or dealumination
    • C01B39/02—Crystalline aluminosilicate zeolites; Isomorphous compounds thereof; Direct preparation thereof; Preparation thereof starting from a reaction mixture containing a crystalline zeolite of another type, or from preformed reactants; After-treatment thereof
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    • C07F15/00—Compounds containing elements of Groups 8, 9, 10 or 18 of the Periodic Table
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    • C07F19/00—Metal compounds according to more than one of main groups C07F1/00 - C07F17/00
    • C07F19/005—Metal compounds according to more than one of main groups C07F1/00 - C07F17/00 without metal-C linkages
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    • C07F3/00—Compounds containing elements of Groups 2 or 12 of the Periodic Table
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    • C07F3/00—Compounds containing elements of Groups 2 or 12 of the Periodic Table
    • C07F3/003—Compounds containing elements of Groups 2 or 12 of the Periodic Table without C-Metal linkages
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    • C07F3/00—Compounds containing elements of Groups 2 or 12 of the Periodic Table
    • C07F3/06—Zinc compounds
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C11/00—Use of gas-solvents or gas-sorbents in vessels
    • F17C11/005—Use of gas-solvents or gas-sorbents in vessels for hydrogen
    • B—PERFORMING OPERATIONS; TRANSPORTING
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    • B01J2531/00—Additional information regarding catalytic systems classified in B01J31/00
    • B01J2531/02—Compositional aspects of complexes used, e.g. polynuclearity
    • B01J2531/0213—Complexes without C-metal linkages
    • B01J2531/0216—Bi- or polynuclear complexes, i.e. comprising two or more metal coordination centres, without metal-metal bonds, e.g. Cp(Lx)Zr-imidazole-Zr(Lx)Cp
    • B—PERFORMING OPERATIONS; TRANSPORTING
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    • B01J2531/00—Additional information regarding catalytic systems classified in B01J31/00
    • B01J2531/20—Complexes comprising metals of Group II (IIA or IIB) as the central metal
    • B01J2531/26—Zinc
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    • B01J2531/30—Complexes comprising metals of Group III (IIIA or IIIB) as the central metal
    • B01J2531/33—Indium
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    • B01J2531/845—Cobalt
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    • Y02C20/40—Capture or disposal of greenhouse gases of CO2

Definitions

  • the present invention relates to crystalline zeolites and to methods of use thereof.
  • a large segment of the global economy ($350 billion) is based on the use of crystalline microporous zeolites in petrochemical cracking, ion-exchange for water softening and purification, and in the separation of gases.
  • Zeolite structures are composed of tetrahedral Si(Al)O 4 units covalently joined by bridging O atoms to produce ⁇ 150 different types of framework.
  • a long-standing challenge is to incorporate transition metal ions and organic units within their pores and, more desirably, to do so as an integral part of the zeolite framework. This ability would be useful in many catalytic applications because the pores would be lined with a high concentration of ordered transition metal sites whose electronic and steric properties can be tailored by functionalization of the organic links.
  • the vision of achieving such a zeolite that combines these features remains largely unrealized.
  • An embodiment of the present invention provides a zeolitic framework, comprising the general structure M-L-M, wherein M comprises a transition metal and L is a linking moiety comprising a structure selected from the group consisting of I, II, III, or any combination thereof:
  • A, A 1 , A 2 , A 3 , A 4 , A 5 , A 6 , and A 7 can be either C or N, wherein R 5 -R 8 are present when A 1 and A 4 comprise C, wherein R 1 , R 4 or R 9 comprise a non-sterically hindering group that does not interfere with M, wherein R 2 , R 3 , R 5 , R 6 , R 7 , R 8 , R 10 , R 11 , R 12 are each individually an alkyl, halo-, cyano-, or nitro-, wherein M 1 , M 2 , M 3 , M 4 , M 5 , M 6 each comprise a transition metal (these are instances of M), wherein when the linking group comprises structure III, R 10 , R 11 and R 12 are each individually electron withdrawing groups.
  • R 1 , R 4 and R 9 are individually small groups selected from the group consisting of H, methyl-, halo-, cyano-, and ethyl-.
  • R 10 , R 11 and R 12 are each individually selected from the group consisting of a nitro-, cyano-, fluoro- and chloro-group.
  • the linking moeity is an imidazolate or an imidazolate derivative.
  • the imidazolate or imidazolate derivate is selected from the group consisting of IV, V, VI, VII, VIII, and IX:
  • the imidazolate or imidazolate derivative is selected from the group consisting of a substituted imidazolate; a benzimidazolate comprising a methyl-, nitro-, cyano, or chloro-group; an azabenzimidazolate; and an azabenzimidazolate wherein one or two carbon atoms on the benzimidazolate are replaced by nitrogen.
  • the transition metal is selected from the group consisting of Sc, Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Zn, Y, Zr, Nb, Mo, Tc, Ru, Rh, Pd, Ag, Cd, Lu, Hf, Ta, W, Re, Os, Ir, Pt, Au, Hg, Lr, Rf, Db, Sg, Bh, Hs, Mt, Ds, Rg and Uub.
  • a zeolitic framework comprises a heterogeneous combination of transition metals.
  • the zeolitic framework comprises homogenous transition metal(s) but a heterogeneous combination of linking moieties.
  • a zeolitic framework comprises a heterogeneous mixture of transition metals and linking moieties.
  • the present invention provides a zeolitic framework wherein the zeolitic framework comprises a framework structure selected from the group consisting of ABW, ACO, AEI, AEL, AEN, AET, AFG, AFI, AFN, AFO, AFR, AFS, AFT, AFX, AFY, AHT, ANA, APC, APD, AST, ASV, ATN, ATO, ATS, ATT, ATV, AWO, AWW, BCT, BEA, BEC, BIK, BOG, BPH, BRE, CAN, CAS, CDO, CFI, CGF, CGS, CHA, CHI, CLO, CON, CZP, DAC, DDR, DFO, DFT, DOH, DON, EAB, EDI, EMT, EON, EPI, ERI, ESV, ETR, EUO, EZT, FAR, FAU, FER, FRA, GIS, GIU, GME, GON,
  • Variations of zeolitic frameworks of the invention can comprise one or more of the following characteristics: a surface area of a pore of the plurality of pores is greater than about 2000 m 2 /g; a surface area of a pore of the plurality of pores is about 3,000-18,000 m 2 /g; a surface area of a pore of the plurality of pores is about 3,000-6,000 m 2 /g; a pore of the plurality of pores comprises a pore volume 0.1 to 0.99 cm 3 /g; a pore of the plurality of pores comprises a pore volume of 0.4-0.5 cm 3 /g; a framework density of about 0.17 g/cm 3 ; atomic coordinates as set forth in any one of the tables described herein.
  • Some zeolitic frameworks of the invention may be interpenetrating. Furthermore, some zeolitic frameworks of the invention can be used to adsorbed chemical species (e.g., ammonia, carbon dioxide, carbon monoxide, hydrogen, amines, methane, oxygen, argon, nitrogen, argon, organic dyes, polycyclic organic molecules, and combinations thereof). Some zeolitic frameworks of the invention can be used for gas storage, in sensors and as a catalyst.
  • chemical species e.g., ammonia, carbon dioxide, carbon monoxide, hydrogen, amines, methane, oxygen, argon, nitrogen, argon, organic dyes, polycyclic organic molecules, and combinations thereof.
  • FIG. 1 shows the single crystal x-ray structures of ZIFs. (Left and Center) In each row, the net is shown as a stick diagram (Left) and as a tiling (Center). (Right) The largest cage in each ZIF is shown with ZnN 4 tetrahedra in gray, and, for ZIF-5, InN6 octahedra in gray. H atoms are omitted for clarity.
  • FIG. 2A-C shows the gas-sorption isotherms for prototypical ZIFs.
  • Nitrogen isotherm at 77 K for ZIF-8 sod (a) Nitrogen isotherm at 77 K for ZIF-8 sod.
  • FIG. 3A-D shows the PXRD patterns for ZIF-8 samples measured during chemical stability tests.
  • (a) In refluxing benzene at 80° C. for up to 7 days.
  • (b) In refluxing methanol at 65° C. for up to 7 days.
  • (c) In refluxing water at 100° C. for up to 7 days.
  • (d) In refluxing aqueous NaOH solution for up to 1 day.
  • FIG. 4A-B provides the FT-IR spectra of (a) imidazole and (b) ZIF-5 (gar), In 2 Zn 3 (IM) 12 .
  • FIG. 5 is an ORTEP diagram of the Asymmetric Unit of ZIF-1 including dimethyl acetamide guest molecule.
  • FIG. 6 is an ORTEP diagram of the asymmetric unit of ZIF-2 including guest dimethylformamide molecules. Ellipsoids are displayed at the 50% probability level.
  • FIG. 7 is an ORTEP diagram of the asymmetric unit of ZIF-3 framework.
  • FIG. 8 is an ORTEP diagram of the asymmetric unit of ZIF-4 including guest dimethylformamide molecule.
  • FIG. 9 is an ORTEP diagram of the asymmetric unit of the ZIF-5 framework. Ellipsoids are displayed at the 50% probability level.
  • FIG. 10 is an ORTEP diagram for the asymmetric unit of the ZIF-6 framework.
  • FIG. 11 is an ORTEP representative of the asymmetric unit of the ZIF-7 framework.
  • FIG. 12 is an ORTEP diagram of the asymmetric unit of the ZIF-8 framework.
  • FIG. 13 is an ORTEP diagram of the asymmetric unit of the ZIF-9 framework.
  • FIG. 14 is an ORTEP diagram of the asymmetric unit of ZIF-10 framework.
  • FIG. 15 is an ORTEP diagram of the asymmetric unit of the ZIF-11 framework.
  • FIG. 16 is an ORTEP diagram of the asymmetric unit of ZIF-12 framework.
  • FIG. 17 shows a comparison of the experimental PXRD pattern of as-prepared ZIF-1 (top) with the one simulated from its single crystal structure (bottom). The very high degree of correspondence between the patterns indicates that the bulk material has the same structure as the single crystal.
  • FIG. 18 shows a comparison of the experimental PXRD pattern of as-prepared ZIF-4 (top) with the one simulated from its single crystal structure (bottom). The very high degree of correspondence between the patterns indicates that the bulk material has the same structure as the single crystal.
  • FIG. 19 shows a comparison of the experimental PXRD pattern of as-prepared ZIF-7 (top) with the one simulated from its single crystal structure (bottom). The very high degree of correspondence between the patterns indicates that the bulk material has the same structure as the single crystal.
  • FIG. 20 shows a comparison of the experimental PXRD pattern of as-prepared ZIF-11 (top) with the one simulated from its single crystal structure (bottom). The very high degree of correspondence between the patterns indicates that the bulk material has the same structure as the single crystal.
  • FIG. 21 shows PXRD patterns of ZIF-7 collected during stability test in benzene at room temperature.
  • the framework structure of ZIF-7 was unchanged after 7 days.
  • FIG. 22 shows PXRD patterns of ZIF-7 collected during stability test in benzene at 50° C. The framework structure of ZIF-7 was unchanged after 7 days.
  • FIG. 23 shows PXRD patterns of ZIF-7 collected during stability test in benzene at 80° C. The framework structure of ZIF-7 was unchanged after 7 days.
  • FIG. 24 shows PXRD patterns of ZIF-7 collected during stability test in methanol at room temperature.
  • the framework structure of ZIF-7 was unchanged after 7 days.
  • FIG. 25 shows PXRD patterns of ZIF-7 collected during stability test in methanol at 50° C. The framework structure of ZIF-7 was unchanged after 7 days.
  • FIG. 26 shows PXRD patterns of ZIF-7 collected during stability test in refluxing methanol.
  • the framework structure of ZIF-7 was unchanged after 7 days.
  • FIG. 27 shows PXRD patterns of ZIF-7 collected during stability test in water at room temperature. The framework structure of ZIF-7 was unchanged after 7 days.
  • FIG. 28 shows PXRD patterns of ZIF-7 collected during stability test in water at 50° C. The framework structure of ZIF-7 was unchanged after 7 days.
  • FIG. 29 shows PXRD patterns of ZIF-11 collected during stability test in benzene at room temperature.
  • the framework structure of ZIF-11 was unchanged after 7 days.
  • FIG. 30 shows PXRD patterns of ZIF-11 collected during stability test in refluxing benzene.
  • the framework structure of ZIF-11 was unchanged after 7 days.
  • FIG. 31 shows PXRD patterns of ZIF-11 collected during stability test in refluxing methanol.
  • the framework structure of ZIF-11 was unchanged after 7 days.
  • FIG. 32 shows PXRD patterns of ZIF-11 collected during stability test in water at 5 ° C. The framework structure of ZIF-11 was unchanged after 7 days.
  • FIG. 33 shows TGA trace of as-synthesized ZIF-1 (crb).
  • FIG. 34 shows TGA trace of as-synthesized ZIF-7 (sod).
  • FIG. 35 shows The overlay of TGA traces of as-synthesized, solvent-exchanged, and evacuated (activated) samples of (a) ZIF-8 and (b) ZIF-11.
  • FIG. 36 depicts the position of the nitrogen atoms in the imidazolate-type linkers is significant in the selection of which zeolite imidazolate framework (ZIF) topology (SOD, RHO, dia, and LTA) is produced.
  • ZIF zeolite imidazolate framework
  • FIG. 37 depicts cage constituents of the LTA topology.
  • the structure is shown as an exploded tiling of cubes, truncated octahedral and truncated cuboctahedra.
  • FIG. 38A-E show an X-ray single crystal structure of ZIF-20 having the same LTA topology as zeolite A.
  • oxygen and silicon atoms in zeolite A are replaced by benzimidazolates and tetrahedral zinc atoms, respectively, to give an expanded two ⁇ -cages, a and b, ⁇ -cage, c, and cube, d.
  • Linkage between two cubes, e is important in the reticulation of the structure. Notice the close approach of pairs of C/N atoms. ZnN 4 tetrahedra, carbon and nitrogen.
  • FIG. 39 shows argon adsorption measured at 87K for ZIF-20 showing type I behavior indicative of a permanently porous material, and a high surface area compared to zeolite A. Filled and open circles represent adsorption and desorption, respectively.
  • FIG. 40 shows ORTEP drawing of the asymmetric unit of ZIF-20, excluding the guest entities and hydrogen atoms are excluded also for clarity. Ellipsoids are displayed at the 50% probability level.
  • FIG. 41 shows ORTEP drawing of the asymmetric unit of ZIF-21, excluding the guest entities and hydrogen atoms are excluded also for clarity. Ellipsoids are displayed at the 50% probability level. Note that the organic purinate ligands have been refined isotropically.
  • FIG. 42 shows ORTEP drawing of the asymmetric unit of ZIF-22, excluding the guest entities and hydrogen atoms are excluded also for clarity. Ellipsoids are displayed at the 50% probability level.
  • FIG. 43 shows ORTEP drawing of the asymmetric unit of ZIF-23, hydrogen atoms are excluded also for clarity. Ellipsoids are displayed at the 50% probability level.
  • FIG. 44 shows a comparison of the experimental PXRD pattern of as-synthesized, MeOH-exchanged and activated ZIF-20 along with the simulated pattern from the single X-ray crystal structure.
  • FIG. 45 shows a comparison of the experimental PXRD pattern of as-synthesized ZIF-21 along with the simulated pattern from the single X-ray crystal structure.
  • FIG. 46 shows a comparison of the experimental PXRD pattern of as-synthesized ZIF-22 along with the simulated pattern from the single X-ray crystal structure.
  • FIG. 47 shows a comparison of the experimental PXRD pattern of as synthesized ZIF-23 along with the simulated pattern from the single X-ray crystal structure.
  • FIG. 48 is an overlay of TGA traces of as-synthesized, solvent-exchanged, and activated samples of ZIF-20.
  • FIG. 49 shows a TGA trace of as-synthesized sample of ZIF-21.
  • FIG. 50 shows a TGA trace of as-synthesized sample of ZIF-22.
  • Zeolitic frameworks are a class of porous materials that potentially have the advantages both of inorganic zeolites (e.g., high stability) and of MOFs (e.g., high porosity and organic functionality), which could be applied to highly efficient catalysis and separations.
  • zeolitic framework topologies can be directed by the molecular structure of the organic linker and rationalized by examining the resulting linker-linker interactions in the zeolitic frameworks.
  • the potential difficulty in predicting zeolitic structures such as is always encountered in zeolite chemistry, can be overcome by further detailing the linker requirements for forming the basic secondary building units (cube in the case LTA) in the structure.
  • zeolites are crystalline aluminosilicates having ordered channel and cage structures and containing micropores which are typically smaller than about 0.9 nm.
  • the network of such zeolites is made up of SiO 4 and AlO 4 tetrahedra which are joined via shared oxygen bridges.
  • zeolites having a pentasil structure in particular the types assigned by X-ray analysis to the ABW, AGO, AEI, AEL, AEN, AET, AFG, AFI, AFN, AFO, AFR, AFS, AFT, AFX, AFY, AHT, ANA, APC, APD, AST, ATN, ATO, ATS, ATT, ATV, AWO, AWW, BEA, BIK, BOG, BPH, BRE, CAN, CAS, CFI, CGF, CGS, CHA, CHI, CLO, CON, CZP, DAC, DDR, DFO, DFT, DOH, DON, EAB, EDI, EMT, EPI, ERI, ESV, EUO, FAU, FER, GIS, GME, GOO, HEU, IFR, ISV, ITE, JBW, KFI, LAU, LEV, LIO, LOS, LOV, LTA, L
  • a “core” refers to a repeating unit or units found in a framework. Such a framework can comprise a homogenous repeating core or a heterogenous repeating core structure.
  • a core comprises a transition metal and a linking moiety.
  • a plurality of cores linked together defines a framework.
  • linking moiety refers to a mono-dentate or bidentate compound that bind a transition metal or a plurality of transition metals, respectively.
  • a “zeolitic framework,” as used herein, refers to a framework of repeating cores having a zeolite-type structure.
  • a “zeolitic imidizolate framework” or “ZIF” refers to a zeolitic framework comprising a zeolitic structure having an imidizole, imidizolate-derivative, or imidizolate linking group.
  • the disclosure provides zeolitic frameworks comprising a network of homogenous transition metal or heterogeneous transition metals linked by a homogenous or heterogeneous linking moiety.
  • the zeolitic frameworks of the disclosure can comprise any of the networks currently defined in the Atlas of Zeolite Structure Types known in the literature.
  • the zeolitic frameworks of the disclosure provide nanoporous structure useful for filtration, gas storage and the like, as more fully described herein.
  • the disclosure also provide a general synthesis of structures having zeolite framework topologies in which all tetrahedral atoms are transition metals, and the linking moieties comprise organic linkers comprising nitrogen, sulfur or oxygen organic molecules (e.g., such as imidazolate (IM) units).
  • IM imidazolate
  • compositions of the disclosure comprise a zeolite tetrahedral net comprising a transition metal core and a linking moeity.
  • Useful transition metal comprise any one or more of the following: Sc, Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Zn, Y, Zr, Nb, Mo, Tc, Ru, Rh, Pd, Ag, Cd, Lu, Hf, Ta, W, Re, Os, Ir, Pt, Au, Hg, Lr, Rf, Db, Sg, Bh, Hs, Mt, Ds, Rg, and Uub.
  • a linker useful in the zeolite compositions of the disclosure can be selected from the group consisting of structure I, II, III, and any combination thereof:
  • A, A 1 , A 2 , A 3 , A 4 , A 5 , A 6 , and A 7 can be either C or N, wherein R 5 -R 8 are present when A 1 -A 4 comprise C, wherein R 1 , R 4 or R 9 comprise a non-sterically hindering group (e.g., alkyl group) that does not interfere with a transition metal (M) linked to the linking moiety, wherein R 2 , R 3 , R 5 , R 6 , R 7 , R 8 , R 10 , R 11 , R 12 are each individually an alkyl, aryl-, halo-, cyano- or nitro-, wherein M 1 , M 2 , M 3 , M 4 , M 5 , M 6 each comprise a transition metal, wherein when the linking group comprises structure III, R 10 , R 11 and R 12 are each individually electron withdrawing groups.
  • R 5 -R 8 are present when A 1 -A 4 comprise C
  • R 1 , R 4 and R 9 are individually small group selected from the group consisting of H, methyl-, halo-, cyano-, and ethyl-.
  • R 10 , R 11 and R 12 are each individually selected from the group consisting of a nitro-, cyano-, fluoro-, and chloro-group.
  • an alkyl group can have from 1 to 10 carbon atoms and an aryl group can have from 1 to 5 phenyl rings.
  • the linking moiety can be bidentate or monodentate.
  • a zeolitic framework can comprise a combination of bidentate or monodentate linking moeities.
  • the linking group can comprise an imidizole or imidizolate moiety such as a member selected from the group consisting of IV, V, VI, VII, VIII, and IX:
  • hetercyclic rings including imidazolate compounds and derivative such as substituted imidazolate, benzimidazolate, methyl-, nitro-, cyano, or chloro-groups, azabenzimidazolate, azabenzimidazolte wherein one or two carbon atoms on the benzimidazolate are replaced by nitrogen and the like can be used.
  • the zeolitic framework (e.g., a ZIF) of the disclosure can take any framework/structure.
  • ZIFs having any of the following framework codes can be obtained: ABW, ACO, AEI, AEL, AEN, AET, AFG, AFI, AFN, AFO, AFR, AFS, AFT, AFX, AFY, AHT, ANA, APC, APD, AST, ASV, ATN, ATO, ATS, ATT, ATV, AWO, AWW, BCT, BEA, BEC, BIK, BOG, BPH, BRE, CAN, CAS, CDO, CFI, CGF, CGS, CHA, CHI, CLO, CON, CZP, DAC, DDR, DFO, DFT, DOH, DON, EAB, EDI, EMT, EON, EPI, ERI, ESV, ETR, EUO, EZT, FAR, FAU, FER, F
  • a transition metal and linking moiety core have been used to generate a plurality of zeolitic frameworks.
  • zeolitic imidazolate frameworks ZIFs
  • ZIFs zeolitic imidazolate frameworks
  • the ZIF crystal structures are based on the nets of a plurality of distinct aluminosilicate zeolites: tetrahedral Si(Al) and the bridging O are replaced with transition metal ion and an imidazolate link, respectively.
  • Imidazole for example, can lose a proton to form IM.
  • metal IMs adopt open-framework zeolite structures. Indeed, a number of new Fe(II) (5), Co(II), Cu(II), and Zn(II) IM compounds have structures that are based on zeolite-like tetrahedral nets.
  • the disclosure provides a general strategy that has led to zeolitic structures based on other zeolite nets.
  • the disclosure confirms the porosity of ZIFs of the disclosure and unlike other metal-organic compounds, the zeolitic frameworks (ZIFs) have exceptional chemical stability in refluxing organic solvents, water, and aqueous alkaline solution, a finding that has not been described previously. These results point to the potential applications and rich structural diversity of this as-yet-undeveloped class of porous materials.
  • a zeolitic framework of the disclosure such as a ZIF
  • FIG. 1 illustrates examples of precipitated structures. In FIG. 1 , the metal center of each structure is coordinated by the N atoms of IM to give overall neutral frameworks.
  • the five-membered IM ring serves as the bridging/linking unit between the transition metal centers and imparts angle 1 of ⁇ 145° throughout the frameworks via coordinating N atoms in the 1,3-positions of the ring.
  • the organic components of the zeolitic framework provides organically lined cages and channels rather than a silicate oxide surface as in prior zeolites.
  • the zeolitic frameworks of the disclosure are comparable with some of the very porous MOF compounds in surface area and pore volume, and they outperform traditional crystalline microporous materials such as zeolites and ordered mesoporous silicas. Although not required and not wanting to be bound by any theory, this performance may be due in part to the fully exposed edges and faces of the organic links; characteristics that have been proposed as key to creating exceptionally high surface areas.
  • the frameworks comprising a core, wherein the core comprises a plurality of transition metals linked by linking moiety having a structure selected from I-IX, comprises a plurality of pores having a surface area greater than about 2000 m 2 /g (e.g., about 3,000-18,000 m 2 /g or about 3,000-6,000 m 2 /g).
  • the plurality of pores of a framework of the disclosure comprises a pore volume 0.1 to 0.99 cm 3 /cm 3 (e.g., about 0.4-0.5 cm 3 /cm 3 ).
  • a framework of the disclosure comprises a density of about 0.17 g/cm 3 .
  • a zeolitic framework of the disclosure can comprise a core comprising the atomic coordinates as set forth in any one of the tables herein.
  • the zeolitic framework set forth above may include an interpenetrating frameworks that increases the surface area of the framework.
  • the frameworks of the disclosure may advantageously exclude such interpenetration, there are circumstances when the inclusion of an interpenetrating framework may be used to increase the surface area.
  • a gas storage material comprising a zeolitic framework.
  • the zeolitic framework includes one or more sites for storing gas molecules.
  • Gases that may be stored in the gas storage material of the disclosure include gas molecules comprising available electron density for attachment to the one or more sites on the surface are of a pore or interpenetrating porous network. Such electron density includes molecules having multiple bonds between two atoms contained therein or molecules having a lone pair of electrons.
  • gases include, but are not limited to, the gases comprising a component selected from the group consisting of ammonia, argon, carbon dioxide, carbon monoxide, hydrogen, and combinations thereof.
  • the gas storage material is a hydrogen storage material that is used to store hydrogen (H 2 ).
  • the gas storage material is a carbon dioxide storage material that may be used to separate carbon dioxide from a gaseous mixture.
  • the gaseous storage site comprises a pore in a zeolitic framework.
  • this activation involves removing one or more chemical moieties (guest molecules) from the zeolitic framework.
  • guest molecules include species such as water, solvent molecules contained within the zeolitic framework, and other chemical moieties having electron density available for attachment.
  • the zeolitic framework used in the embodiments of the disclosure include a plurality of pores for gas adsorption.
  • the plurality of pores has a unimodal size distribution.
  • the plurality of pores have a multimodal (e.g., bimodal) size distribution.
  • the disclosure also provide chemical sensors (e.g. resistometric sensors) capable of sensing the presence of an analyte of interest.
  • chemical sensors e.g. resistometric sensors
  • the porous structures of the disclosure provide a defined interaction area that limits the ability of contaminate to contact a sensor material the passes through the porous structure of the zeolitic framework of the disclosure.
  • various polymers are used in sensor systems including conductive polymers (e.g., poly(anilines) and polythiophenes), composites of conductive polymers and non-conductive polymers and composites of conductive materials and non-conductive materials.
  • conductive leads are separated by the conductive material such that a current traverse between the leads and through the sensor material.
  • the resistance in the material changes and detectable signal is thus generated.
  • the area surrounding the sensor material is limited and serves as a “filter” to limit contaminants from contacting the sensor material, thus increasing sensor specificity.
  • the disclosure further provides zeolitic catalyst comprising a zeolitic framework of the disclosure.
  • the zeolitic material of the disclosure can be used in the catalytic conversion of organic molecules. Reactions of this type are, for example, oxidations, the epoxidation of olefins, e.g. the preparation of propylene oxide from propylene and H 2 O 2 the hydroxylation of aromatics, e.g. the preparation of hydroquinone from phenol and H 2 O 2 or the conversion of toluene into cresol, the conversion of alkanes into alcohols, aldehydes and acids, isomerization, reactions, for example the conversion of epoxides into aldehydes.
  • Table 1 demonstrates zeolite topologies DFT, GIS, and MER resulting from the methods of the disclosure. Furthermore, the disclosure demonstrates that the ZIFs of the disclosure are not restricted to purely tetrahedral nets.
  • This structure has the topology of the Al 2 Si 3 O 12 part of a garnet, such as grossularite Ca 3 Al 2 Si 3 O 12 .
  • the synthesis of this structure hints at the extraordinarily rich chemistry using linking moieties of the disclosure, such as IMs.
  • Table 1 summarizes topology, density, and pore size data for some of the ZIFs of the disclosure.
  • the nets of the structures are denoted by a three-letter symbol that is often the same as that of the corresponding zeolite net.
  • the density of ZIFs are denoted by using the traditional zeolite measure of number of tetrahedral vertices per unit volume (T/V).
  • T/V tetrahedral vertices per unit volume
  • Si distance in a silicate is ⁇ 3.0 ⁇ ; accordingly, the density (T/V) of an IM analog (i.e., ZIF) of a silicate zeolite is eight times less.
  • T/V is in the range 2.0-3.7 nm (Table 1).
  • the density for oxide zeolites is 12-20 nm ⁇ 3 , and for the lowest-density known oxide framework it is 7.1 nm ⁇ 3 .
  • the atom nearest to the center of the cavity is H, a van der Waals radius of 1.2 ⁇ was used for H in determining the fitting sphere size. Note that this value is an approximate indicator of the cage volume because in some cases the cages are elliptical.
  • the table also gives the number of vertices of the largest cage in each structure; this value ranges from 12 (crb) to 48(rho).
  • FIG. 1 eight nets of the ZIF structures of the disclosure are depicted in three ways. First, as stick diagrams of the nets; next, the same structures decomposed into tiles (generalized polyhedra or cages that combine to completely fill space). For some structures (i.e., cag, gis, and sod) there is just one kind of tile. Finally, the largest cage in the real structure of representative IMs is shown on the right. Replacement of Zn(II) by Co(II) makes essentially no metrical difference to the structure; thus, ZIF-7 and -11 are virtually identical to ZIF-9 and -12, respectively.
  • TGA Thermal gravimetric analysis
  • the amide guests included in as-synthesized ZIF-8 and -11 could be more readily removed by solvent-exchange.
  • the thermogravimetric behavior of ZIF-8 and -11 were significantly simplified after they were immersed in organic solvents, such as methanol.
  • organic solvents such as methanol.
  • the as-synthesized ZIF samples were immersed in methanol at ambient temperature for 48 hours, and evacuated at ambient temperature for 5 h, then at an elevated temperature (300° C. for ZIF-8; 180° C. for ZIF-11) for 2 h.
  • ZIF samples thus obtained were optimally evacuated, as evidenced by their well maintained PXRD patterns and the long plateau (25-550° C.) in their TGA traces.
  • ZIF-8 was similar to ZIF-11 in hydrogen uptake when the adsorbate pressure approached 1 atm [145 cm 3 /g at standard temperature and pressure (STP)] or 12.9 mg/g for ZIF-8; 154 cm 3 /g STP or 13.7 mg/g for ZIF-11). This result is expected because ZIF-8 has higher surface area and pore volume (Table 2).
  • the ultimate hydrogen capacity of ZIF-8 was uncovered in a high-pressure (up to 80 bar) hydrogen sorption measurement at 77 K on a large batch of evacuated ZIF-8 (0.724 g), which showed 350 cm 3 /g STP (31 mg/g) at 55 bar.
  • the hydrogen uptake of ZIF-8 and its Langmuir surface area (1,810 m 2 /g) fit well in a linear relationship proposed recently based on our high-pressure hydrogen sorption measurements on a series of MOFs with high surface areas.
  • ZIFs The chemical stability of ZIFs was examined by suspending samples of ZIF-8 and -11 in boiling benzene, methanol, water, and aqueous sodiumhydroxide ( FIG. 3 ), conditions that reflect extreme operational parameters of typical industrial chemical processes.
  • ZIF samples were immersed in the desired solvent for 1-7 days at ambient temperature, 50° C., and at the boiling point of each medium. During this process, samples were periodically observed under an optical microscope and found to be insoluble under each of these conditions. PXRD patterns collected for each sample at designated intervals showed that the solid samples of ZIF-8 and -11 maintained their full crystallinity and were impervious to the boiling organic solvents for 7 days. Both ZIFs sustained their structures in water at 50° C. for 7 days.
  • ZIF-8 thus was further probed and shown to be unchanged for up to 24 hours in 0.1 and 8 M aqueous sodium hydroxide at 100° C.
  • the hydrothermal stability of ZIF-8 is superior to those of original MCM and SBA types of ordered mesoporous silica, even rivaling the ultrastable derivatives of these materials.
  • Benzimidazole, 2-methylimidazole, Indium nitrate pentahydrate and cobalt nitrate hexahydrate were purchased from the Aldrich Chemical Co. and imidazole, N,N-dimethylformamaide (DMF), N-methylpyrrolidinone (NMP) were purchased from the Fisher Scientific International Inc. N,N-diethylformamide (DEF) was obtained from BASF Corporation. Zinc nitrate tetrahydrate was purchased from the EM Science. All starting materials were used without further purifications. All experimental operations were performed in air.
  • ZIF syntheses are exemplified here by the synthesis of ZIF-8)
  • a solid mixture of zinc nitrate tetrahydrate Zn(NO 3 ) 2 .4H 2 O (0.210 g, 8.03 ⁇ 10 ⁇ 4 mol) and 2-methylimidazole (H-MeIM) (0.060 g, 7.31 ⁇ 10 ⁇ 4 mol) was dissolved in 18 ml of DMF in a 20-ml vial.
  • the vial was capped and heated at a rate of 5° C./min to 140° C. in a programmable oven and held at this temperature for 24 h, then cooled at a rate of 0.4° C./min to room temperature.
  • Atomic coordinates are available for download from the Cambridge Crystallographic Data Centre by citing deposition numbers 602535 (ZIF-1), 602536 (ZIF-2), 602537 (ZIF-3), 602538 (ZIF-4), 602539 (ZIF-5), 602540 (ZIF-6), 602541 (ZIF-7), 602542 (ZIF-8), 602543 (ZIF-9), 602544 (ZIF-10), 602545 (ZIF-11), 602546 (ZIF-12).
  • Powder x-ray data were collected by using a D8-Advance ⁇ -2 ⁇ diffractometer (Bruker) in reflectance Bragg-Brentano geometry employing Ni-filtered CuK ⁇ line focused radiation at 1,600 W (40 kV, 40 mA) power and equipped with a Na(Tl) scintillation detector fitted with a 0.2-mm radiation entrance slit. Samples were mounted on zero background sample holders by dropping powders from a wide-blade spatula and then leveling the sample surface with a razor blade. All samples were ground before PXRD experiment.
  • ZIF-8 and -11 samples were immersed in methanol at ambient temperature for 48 hours and evacuated at ambient temperature for 5 h, then at an elevated temperature (300° C. for ZIF-8, 180° C. for ZIF-11) for 2 h.
  • ZIF-1 crb Zn(IM)2.(Me2NH).
  • a solid mixture of zinc nitrate tetrahydrate Zn(NO3)2.4H2O (0.09 g, 3.44 ⁇ 10 ⁇ 4 mol) and imidazole (H-IM) (0.15 g, 2.20 ⁇ 10 ⁇ 3 mol) was dissolved in 18 mL DMF in a 20-mL vial.
  • the vial was capped and heated for 24 hours in a 85° C. isothermal oven. The vial was then removed from the oven and allowed to cool to room temperature naturally.
  • FT-IR (KBr 4000-400 cm ⁇ 1 ): 3445(br), 3103(w), 2935(w), 2385(w), 2355(w), 1647(s), 1499(m), 1418(w), 1403(w), 1321(w), 1291(w), 1245(w), 1184(w), 1087(s), 1026(w), 985(w), 960(m), 837(w), 761(m), 680(m), 603(w).
  • ZIF-3 dft Zn(IM)2.
  • a solid mixture of zinc nitrate tetrahydrate Zn(NO3)2.4H2O (0.010 g, 3.82 ⁇ 10 ⁇ 5 mol) and imidazole (H-IM) (0.030 g, 4.41 ⁇ 10 ⁇ 4 mol) was added in a 4-mL vial and dissolved in a mixed solvent of DMF (2 mL) and NMP (1 mL).
  • the vial was capped and heated for 4 d in a 85° C. isothermal oven. The vial was then removed from the oven and allowed to cool to room temperature naturally.
  • Several prism-shaped crystals formed at the bottom of the vial along with some white powder-like precipitate.
  • the crystals of ZIF-3 were collected manually for single crystal X-ray structure determination.
  • ZIF-4 cag Zn(IM)2.(DMF)(H2O)
  • a solid mixture of zinc nitrate tetrahydrate Zn(NO3)2.4H2O (0.040 g, 1.53 ⁇ 10 ⁇ 4 mol) and imidazole (H-IM) (0.030 g, 4.41 ⁇ 10 ⁇ 4 mol) was dissolved in 3 mL DMF in a 4-mL vial.
  • the vial was capped and heated at a rate 5° C./min to 130° C. in a programmable oven, held at this temperature for 48 hours, then cooled at a rate of 0.4° C./min to room temperature.
  • FT-IR (KBr 4000-400 cm ⁇ 1 ): 3427(br), 3111(w), 2926(w), 2856(w), 1688(m), 1612(br), 1502(m), 1392(w), 1282(w), 1247(w), 1176(w), 1091(s), 986(w), 961(m), 846(w), 770(m), 680(m), 490(br).
  • ZIF-5 was formulated as In2Zn3(IM)12 based on single crystal X-ray structure.
  • the high In/Zn ratio employed in the synthesis was important to the formation of ZIF-5.
  • high Indium content also resulted in small amount of amorphous In-rich impurities (indium oxide or indium hydroxide) as evidenced by the electron microprobe analysis (EMPA) result of the “bright spots” on crystal surfaces.
  • EMPA electron microprobe analysis
  • the content of such impurities was calculated to be 3.3%-4.4% based on the elemental analysis results of C, H, N for the bulk product.
  • the elemental analysis result of Zn/In molar ratio for a small number of the clearest crystals manually separated from the bulk product match the proposed formula well.
  • ZIF-7 sod Zn(PhIM)2.(H2O)3.
  • a solid mixture of zinc nitrate tetrahydrate Zn(NO3)2.4H2O (0.030 g, 1.15 ⁇ 10 ⁇ 4 mol) and benzimidazole (H-PhIM) (0.010 g, 8.46 ⁇ 10 ⁇ 5 mol) was dissolved in 3 mL DMF in a 4-mL vial.
  • the vial was capped and heated at a rate of 5° C./min to 130° C. in a programmable oven, held at this temperature for 48 hours, then cooled at a rate of 0.4° C./min to room temperature.
  • FT-IR (KBr 4000-400 cm ⁇ 1 ): 3450(br), 3063(w), 2930(w), 1678(s), 1622(w), 1479(s), 1387(m), 1306(m), 1286(m), 1245(s), 1209(w), 1189(m), 1123(m), 1097(m), 1011(m), 914(m), 781(m), 746(s), 654(m), 476(m), 435(m).
  • ZIF-8 sod Zn(MeIM)2.(DMF).(H2O)3.
  • a solid mixture of zinc nitrate tetrahydrate Zn(NO3)2.4H2O (0.210 g, 8.03 ⁇ 10 ⁇ 4 mol) and 2-methylimidazole (H-MeIM) (0.060 g, 7.31 ⁇ 10 ⁇ 4 mol) was dissolved in 18 mL DMF in a 20-mL vial.
  • the vial was capped and heated at a rate of 5° C./min to 140° C. in a programmable oven, held at this temperature for 24 hours, then cooled at a rate of 0.4° C./min to room temperature.
  • FT-IR (KBr 4000-400 cm ⁇ 1 ): 3442(br), 3071(w), 2926(w), 1678(s), 1612(w), 1467(s), 1387(w), 1302(w), 1287(m), 1242(s), 1206(w), 1186(w), 1126(w), 1096(w), 1011(w), 916(w), 780(w), 750(s), 660(w), 600(br), 560(w), 475(w).
  • ZIF-10 mer Zn(IM)2.
  • a solid mixture of zinc nitrate tetrahydrate Zn(NO3)2.4H2O (0.010 g, 3.82 ⁇ 10 ⁇ 5 mol) and imidazole (H-IM) (0.030 g, 4.41 ⁇ 10 ⁇ 4 mol) was dissolved in 3 mL DMF in a 4-mL vial.
  • the vial was capped and heated for 4 d in an isothermal oven at 85° C.
  • the reaction mixture was then allowed to cool to room temperature naturally.
  • Several block-shape crystals of ZIF-10 formed on the wall and bottom, and were separated by hand and collected for single crystal X-ray structure determination.
  • ZIF-2 and ZIF-6 were discovered by combinatorial experimentation utilizing a 96-well glass plate (Zinsser, maximum 0.300 mL reaction mixture per well) as reaction vessel.
  • a 0.150 M solution of imidazole in DMF and a 0.075M solution of Zn(NO3)2.4H2O in DMF were used as stock solutions.
  • the 96-well glass plate was loaded with mixtures of stock solutions dispensed by a programmed liquid handler (Gilson, model 215), it was covered with a PTFE sheet, sealed by fastening the sheet with a metal clamp, then heated in a 85° C. isothermal oven for 3 days. After reaction, the products were examined under an optical microscope and characterized by single-crystal X-ray diffraction.
  • ZIF-2 crb Zn(IM)2. 0.265 mL imidazole stock solution (0.150 M, 3.98 ⁇ 10 ⁇ 4 mol) and 0.035 mL Zn(NO3)2.4H2O stock solution (0.075 M, 2.63 ⁇ 10 ⁇ 6 mol). The product was in the form of small rod-shaped single crystals.
  • the FT-IR spectrum of imidazole shows many characteristics of nitrogen-containing heterocycle.
  • the C—H stretch absorbs near 3125 cm ⁇ 1 .
  • the double bonds on the ring absorb with several bands between 1665-1430 cm ⁇ 1 when the ring system is not substituted so as to allow the formation of tautomers.
  • the NH group absorbs strongly between 3335-2500 cm ⁇ 1 , and in many cases is very similar in shape to the OH stretch of the carboxylic acid dimmer. In the imidazoles, this band is accompanied by a weak band near 1820 cm ⁇ 1 . As shown in FIG.
  • ZIF-20 Zn(Pur) 2 .(DMF) 0.75 (H 2 O) 1.5 .
  • a solid mixture of zinc nitrate tetrahydrate Zn(NO 3 ) 2 .4H 2 O (65 mg, 0.25 mmol, EM Science) and purine (150 mg, 1.25 mmol, Fluka or Sigma) was dissolved in 5 mL DMF (Fisher) in a 20-mL vial to obtain a slightly suspended solution.
  • the vial was tightly capped and heated in a 65° C. isothermal oven for 3 days to yield pale yellow octahedral crystals along with small amount of powder.
  • ZIF-21 Co(Pur) 2 .(DMF)(H 2 O).
  • a solid mixture of cobalt(II) nitrate hexahydrate Co(NO 3 ) 2 .6H 2 O (146 mg, 0.502 mmol, Aldrich) and purine (300 mg, 2.50 mmol) were dissolved in DMF (5 mL) in a 20-mL vial.
  • 2.0 M dimethylamine solution in MeOH (1.25 mL, 2.50 mmol, Aldrich) was added.
  • the vial was tightly capped and heated in a 85° C. isothermal oven for 24 hours to yield purple octrahedral crystals.
  • FT-IR (KBr, 4000-400 cm ⁇ 1 ): 3418(br), 3086(w), 2924(w), 2855(w), 1665(s), 1589(s), 1560(m), 1468(s), 1443(w), 1396(s), 1308(s), 1234(w), 1207(s), 1188(s), 1109(m), 916(m), 804(m), 791(w), 677(w), 648(m), 623(w), 573(w), 500(w).
  • ZIF-22 Zn(5-Azabenzimidazolato) 2 .(DMF) 0.75 (H 2 O) 2 .
  • the vial was tightly capped and heated in a 150° C. isothermal oven for 3 days to yield pale yellow octahedral crystals along with small amount of powder.
  • ZIF-23 Zn(4-Azabenzimidazolato) 2 .(H 2 O) 0.25 .
  • a solid mixture of zinc nitrate tetrahydrate Zn(NO 3 ) 2 .4H 2 O (52 mg, 0.20 mmol) and 4-azabenzimidazole (119 mg, 1.00 mmol, Aldrich) was dissolved in 1 mL DMF in a 4-mL vial. The vial was tightly capped and heated in a 100° C. isothermal oven for 1 day to yield pale yellow prism crystals.
  • Atomic coordinates ( ⁇ 10 4 ) and equivalent isotropic displacement parameters ( ⁇ 2 ⁇ 10 3 ) for ZIF-1.
  • U(eq) is defined as one third of the trace of the orthogonalized U ij tensor.
  • Atomic coordinates ( ⁇ 10 4 ) and equivalent isotropic displacement parameters ( ⁇ 2 ⁇ 10 3 ) for ZIF-2.
  • U(eq) is defined as one third of the trace of the orthogonalized U ij tensor.
  • ZIF-3 A colorless prismatic crystal (0.20 ⁇ 0.20 ⁇ 0.15 mm 3 ) of ZIF-3 was placed in a 0.3 mm diameter borosilicate capillary along with a small amount of mother liquor, which was flame sealed, and mounted on a Bruker SMART APEX CCD diffractometer while being flash frozen to 258(2) K in a liquid N2 cooled stream of nitrogen gas. Integration of the data in a primitive tetragonal cell yielded a total of 50492 reflections of which 3091 were unique and 1349 were greater than 4 ⁇ (I). The range of ⁇ was from 1.62 to 25.72°. Analysis of the data showed negligible decay during collection.
  • Atomic coordinates ( ⁇ 10 4 ) and equivalent isotropic displacement parameters ( ⁇ 2 ⁇ 10 3 ) for ZIF-3.
  • U(eq) is defined as one third of the trace of the orthogonalized U ij tensor.
  • Atomic coordinates ( ⁇ 10 4 ) and equivalent isotropic displacement parameters ( ⁇ 2 ⁇ 10 3 ) for ZIF-4.
  • U(eq) is defined as one third of the trace of the orthogonalized U ij tensor.
  • ZIF-5 (GARNET).
  • a colorless prism (0.15 ⁇ 0.12 ⁇ 0.10 mm 3 ) of ZIF-5 was placed in a 0.3 mm diameter borosilicate capillary along with a small amount of mother liquor, which was flame sealed, and mounted on a Bruker SMART APEX CCD diffractometer while being flash frozen to 196(2) K in a liquid N2 cooled stream of nitrogen.
  • a total of 35102 reflections were collected of which 1107 were unique and 997 were greater than 4 ⁇ (I).
  • the range of ⁇ was from 2.27 to 28.26°. Analysis of the data showed negligible decay during collection.
  • Atomic coordinates ( ⁇ 10 4 ) and equivalent isotropic displacement parameters ( ⁇ 2 ⁇ 10 3 ) for ZIF-5.
  • U(eq) is defined as one third of the trace of the orthogonalized U ij tensor.
  • Atoms C4A and C4B were the two components of a disordered carbon atom.
  • the sof of C4A was refined as a free variable to converge at 0.53.
  • Atoms C3A and C3B were two independent carbon atoms in an imidazole ring. This portion of the ring was disordered over two sites related by a two-fold axis. Therefore, the sofs of both C3A and C3B were fixed at 0.50.
  • a protein diffuse scattering correction (SWAT) command was applied to treat the diffuse electron density.
  • the two variables g and U were refined to converge at 1.1 and 2.9, respectively.
  • Atomic coordinates ( ⁇ 10 4 ) and equivalent isotropic displacement parameters ( ⁇ 2 ⁇ 10 3 ) for ZIF-6.
  • U(eq) is defined as one third of the trace of the orthogonalized U ij tensor.
  • Atomic coordinates ( ⁇ 10 4 ) and equivalent isotropic displacement parameters ( ⁇ 2 ⁇ 10 3 ) for ZIF-7.
  • U(eq) is defined as one third of the trace of the orthogonalized U ij tensor.
  • ZIF-8 (SOD—Methyl Derivative).
  • a colorless block crystal (0.16 ⁇ 0.10 ⁇ 0.0 mm 3 ) of ZIF-8 was placed in a 0.3 mm diameter borosilicate capillary along with a small amount of mother liquor, which was flame sealed, and mounted on a Bruker SMART APEX CCD diffractometer while being flash frozen to 258(2) K in a liquid N2 cooled stream of nitrogen.
  • a total of 27202 reflections were collected of which 1302 were unique and 1009 were greater than 4 ⁇ (I).
  • the range of ⁇ was from 2.94 to 29.61°. Analysis of the data showed negligible decay during collection.
  • Atomic coordinates ( ⁇ 10 4 ) and equivalent isotropic displacement parameters ( ⁇ 2 ⁇ 10 3 ) for ZIF-8.
  • U(eq) is defined as one third of the trace of the orthogonalized U ij tensor.
  • ZIF-9 (SOD—Cobalt Form).
  • a purple cubic crystal (0 17 ⁇ 0.17 ⁇ 0.17 mm 3 ) of ZIF-9 was placed in a 0.3 mm diameter borosilicate capillary along with a small amount of mother liquor, which was flame sealed, and mounted on a Bruker SMART APEX CCD diffractometer while being flash frozen to 233(2) K in a liquid N2 cooled stream of nitrogen.
  • a total of 24864 reflections were collected of which 3953 were unique and 2221 were greater than 4 ⁇ (I).
  • the range of ⁇ was from 2.42 to 28.35°. Analysis of the data showed negligible decay during collection.
  • Atomic coordinates ( ⁇ 10 4 ) and equivalent isotropic displacement parameters ( ⁇ 2 ⁇ 10 3 ) for ZIF-9.
  • U(eq) is defined as one third of the trace of the orthogonalized U ij tensor.
  • ZIF-10 (MER).
  • a colorless prismatic crystal (0.20 ⁇ 0.10 ⁇ 0.10 mm 3 ) of ZIF-10 was placed in a 0.3 mm diameter borosilicate capillary along with a small amount of mother liquor, which was flame sealed, and mounted on a Bruker SMART APEX CCD diffractometer while being flash frozen to 233(2) K in a liquid N2 cooled stream of nitrogen.
  • a Bruker SMART APEX CCD diffractometer At total of 66076 reflections were collected of which 3376 were unique and 1771 were greater than 4 ⁇ (I).
  • the range of ⁇ was from 1.06 to 26.37°. Analysis of the data showed negligible decay during collection.
  • Atomic coordinates ( ⁇ 10 4 ) and equivalent isotropic displacement parameters ( ⁇ 2 ⁇ 10 3 ) for ZIF-10.
  • U(eq) is defined as one third of the trace of the orthogonalized U ij tensor.
  • SWAT protein diffuse scattering correction
  • Atomic coordinates ( ⁇ 10 4 ) and equivalent isotropic displacement parameters ( ⁇ 2 ⁇ 10 3 ) for ZIF-11.
  • U(eq) is defined as one third of the trace of the orthogonalized U ij tensor.
  • ZIF-12(RHO—Cobalt Form) A purple cubic crystal (0.08 ⁇ 0.08 ⁇ 0.08 mm 3 ) of ZIF-12 was placed in a 0.3 mm diameter borosilicate capillary along with a small amount of mother liquor, which was flame sealed, and mounted on a Bruker SMART APEX CCD diffractometer while being flash frozen to 233(2) K in a liquid N2 cooled stream of nitrogen. A total of 21631 reflections were collected of which 1204 were unique and 398 were greater than 4 ⁇ (I). The range of ⁇ was from 0.71 to 15.94°.
  • Atomic coordinates ( ⁇ 10 4 ) and equivalent isotropic displacement parameters ( ⁇ 2 ⁇ 10 3 ) for ZIF-12.
  • U(eq) is defined as one third of the trace of the orthogonalized U ij tensor.
  • Atomic coordinates ( ⁇ 10 4 ) and equivalent isotropic displacement parameters ( ⁇ 2 ⁇ 10 3 ) for ZIF-20.
  • U(eq) is defined as one third of the trace of the orthogonalized U ij tensor.
  • Atomic coordinates ( ⁇ 10 4 ) and equivalent isotropic displacement parameters ( ⁇ 2 ⁇ 10 3 ) for ZIF-21.
  • U(eq) is defined as one third of the trace of the orthogonalized U ij tensor.
  • Atomic coordinates ( ⁇ 10 4 ) and equivalent isotropic displacement parameters ( ⁇ 2 ⁇ 10 3 ) for ZIF-22.
  • U(eq) is defined as one third of the trace of the orthogonalized U ij tensor.
  • Atomic coordinates ( ⁇ 10 4 ) and equivalent isotropic displacement parameters ( ⁇ 2 ⁇ 10 3 ) for ZIF-23.
  • U(eq) is defined as one third of the trace of the orthogonalized U ij tensor.
  • Powder X-ray diffraction (PXRD) data were collected using a Bruker D8-Advance ⁇ -2 ⁇ diffractometer in reflectance Bragg-Brentano geometry employing Ni filtered Cu K ⁇ line focused radiation at 1600 W (40kV, 40 mA) power and equipped with a Na(Tl) scintillation detector fitted a 0.2 mm radiation entrance slit. All samples were ground to ensure mono-dispersity in the bulk, then mounted onto a zero-background sample holder by dropping powders from a wide-blade spatula and then leveling the sample surface with a razor blade. The best counting statistics were achieved by using a 0.02° 2 ⁇ step scan from 1.5-60° with an exposure time of 10 s per step.
  • ZIF-7, 8, and 11 were tested for their stability in benzene, methanol and water. These solvents were chosen to compare the relative effects of non-polar to polar solvents. The tests were performed at room temperature, 50° C. and at the boiling point of each solvent (methanol 65° C., benzene 80° C. and water 100° C.) for up to 7 days. The structural stability of the frameworks were monitored by aliquoting portions of the samples for PXRD analysis after every 24 hour period.
  • ZIF-8 and ZIF-11 were evacuated in the following way prior to gas-sorption analysis.
  • the as-synthesized ZIF samples were immersed in methanol at ambient temperature for 48 hours, evacuated at ambient temperature for 5 h, then at an elevated temperature (300° C. for ZIF-8, 180° C. for ZIF-11) for 2 h.
  • ZIF samples thus obtained were optimally evacuated, as evidenced by their well-maintained PXRD patterns and the long plateau (ambient temperature to 550° C.) in their TGA traces, shown in FIG. 35 .
  • this argon isotherm should be classified as a typical Type IV.
  • the hysteresis loop cannot be explained by capillary condensation of argon into mesopores because of its low closure point, and more importantly, because of the lack of any step and hysteresis feature in the mesopore range of the nitrogen isotherm for ZIF-8.
  • the two-step features in both nitrogen and argon isotherms as a result of a rearrangement of the adsorbed gas molecules occurred at a certain threshold pressure, and this effect is significant in the case of ZIF-8 because its aperture size is very close to the sizes of nitrogen and argon molecules.
  • the large difference between the threshold pressures for the second steps in nitrogen and argon isotherms could be due to the different polarizabilities and molecular shapes of nitrogen and argon, which in turn determine how the adsorbed gas molecules distribute and rearrange after the completion of the first steps.
  • the linearity of fitting to Langmuir equation is 1.000000, to BET equation is 0.999710, and the C constant derived from BET equation is ⁇ 663. Therefore, Langmuir model appears to be more suitable for evaluating the surface area of ZIF-8.
  • the values derived from nitrogen isotherm and argon isotherm match well.
  • a micropore volume of 0.656 cm 3 /g was obtained. Again, the value matches the one derived from the counterparts in the nitrogen isotherm.
  • positions 1 and 3 are ideally suited for introducing link-link interactions and together with the geometric control imparted by the nitrogen atoms in positions 1 and 3 direct the structure specifically to LTA ( FIG. 36 ).
  • This approach is a new way to exploit structure-directing agents which also serve as linkers in contrast to the addition of alkylammonium ions and some organic molecules that are well studied in the synthesis of aluminosilicate zeolites.
  • DMF N,N-dimethylformamide
  • FIG. 37 The framework of the LTA structure is illustrated in FIG. 37 , which shows just the vertices (T atoms) and edges (links between the T atoms). It is simply made up of a tiling of cubes, truncated octahedra ( ⁇ -cages), and truncated cuboctahedra ( ⁇ -cages) in the ratio 3:1:1.
  • T atoms are Zn and the linkers are Pur bonding to Zn via the N atoms of the five-membered imidazolate ring ( FIG. 38 ). In this structure the linkers are disordered.
  • the density (T/V) of metal atoms per unit volume is 2.04 nm ⁇ 3 which is much less than that of zeolite A (12.9 nm ⁇ 3 ).
  • An identical structure was found for ZIF-21 in which Co replaces Zn.
  • FIG. 38 shows the separate cages in the structure of ZIF-20; notice that, because of the way the Pur linkers are oriented, there are two kinds of ⁇ -cage as depicted in FIGS. 38 a and 38 b .
  • the ⁇ -cage comprises 48 Zn and 72 Pur (360 C, 216 H, 288 N).
  • the large pore with a diameter of 14.5 ⁇ ( FIG. 38 a ) or 15.4 ⁇ ( FIG. 38 b ) is surrounded by twelve 8-membered rings, eight 12-membered rings, and six 16-membered rings, in which Zn and C atoms in position 2 of Pur were taken as points on rings.
  • the largest 16-membered ring has a pore aperture of 2.8 ⁇ in diameter.
  • the T . . . T distance (ca. 5.9 ⁇ ) in ZIF-20 is extended by replacement of oxide ion into imidazolate linker (the corresponding Si . . . Si distance in an aluminosilicate is ca. 3.0 ⁇ ), which resulted in the larger maximum pore size of the ⁇ -cage compared to that in zeolite A (11.4 ⁇ ).
  • the ⁇ -cage [24 Zn and 36 Pur (180 C, 108 H, 144 N)] ( FIG. 38 c ) and the cube [8 Zn and 12 Pur (60 C, 36 H, 48 N)] ( FIG. 38 d ) have smaller cavities (5.3 and 4.5 ⁇ , respectively) and smaller pore aperture (2.0 ⁇ and 1.5 ⁇ , respectively).
  • the ⁇ -cage can be accessed by some small molecules through the 16-membered window.
  • the LTA structure is the primary topological candidate which can propagate. As has been discussed elsewhere, there are two ways of linking cubes through one kind of edge and these lead to the LTA and ACO topologies, so these are expected to be the default topologies.
  • the permanent porosity of guest-free (activated) ZIF-20 was proven by measurement of argon gas adsorption.
  • As-synthesized ZIF-20 includes approximately 21 wt % of DMF and H 2 O estimated by an elemental analysis and a thermogravimetric analysis (TGA, FIG. 39 ).
  • the activated sample was prepared by exchanging the solvent in as-synthesized ZIF-20 with methanol, followed by evacuation at room temperature.
  • the methanol-exchanged and activated compounds were characterized by a TGA and powder X-ray diffraction (PXRD) measurement (see, FIGS. 48 and 44 , respectively).
  • a type I isotherm (IUPAC classification) observed for Ar adsorption at 87 K indicates the microporosity of activated ZIF-20.
  • the small H 4 hysteresis at P/P 0 >0.4 can be attributed to intercrystalline voids in the sample.
  • the maximum pore aperture (2.8 ⁇ ) of ZIF-20 determined from the crystal structure is smaller than the kinetic diameter of Ar (3.40 ⁇ ).
  • the apparent surface area and pore volume were calculated to be 800 m 2 g ⁇ 1 and 0.27 cm 3 g ⁇ 1 by applying the Langmuir and Dubinin-Radushkevitch (DR) equation, respectively.
  • the sample for the gas adsorption measurement was prepared as follows.
  • the as-synthesized sample of ZIF-20 was immersed in anhydrous methanol in a glove box for 3 days; during the exchange the methanol was refreshed six times.
  • the resulting methanol-exchanged sample of ZIF-20 in methanol was transferred to quartz cell in a glove box and the solvent was roughly decanted by pipette.
  • the wet sample then was evacuated at ambient temperature for 12 hours to yield an activated sample (ca. 200 mg) for gas adsorption measurements.
  • the sample cell with a filler rod was attached to a valve in a glove box, which was kept closed until the start of the measurement, and then attached to the instrument without exposing the sample to air.
  • the diffraction pattern collected for as-synthesized ZIFs are shown in FIG. 44-47 along with the simulated ones from their single X-ray crystal structures.
  • the data for MeOH-exchanged and activated materials of ZIF-20 were also included as shown in FIG. 44 .
  • the TGA traces of as-synthesized ZIF-20, -21, and -22 are shown in FIG. 48-50 , respectively.
  • the weight-loss of 23% up to 250° C. in ZIF-20 corresponds to the release of guest molecules (0.75 DMF and 1.5 H 2 O; calcd. 21%), despite the fact that DMF is actually much larger than the aperture of ZIF-20 in size.
  • the weight-loss of 23% up to 210° C. in ZIF-21 corresponds to the release of guest molecules (1 DMF and 1 H 2 O; calcd. 23%).
  • the weight-loss of 20% up to 250° C. in ZIF-22 corresponds to the release of guest molecules (0.75 DMF and 2 H 2 O; calcd. 23%).
  • FIG. 48 also shows the TGA traces of a MeOH-exchanged and an activated ZIF-20.
  • the original weight-loss up to 250° C. in as-synthesized material was replaced by an initial step of 20% around ambient temperature, indicative of the effective solvent-exchange by methanol.
  • DMF molecule is actually much larger than the aperture of ZIF-20 in size, the solvent-exchange behavior can be explained by a dynamic structure of ZIF-20 as discussed for ZIF-11 in previous report.
  • the profile for an activated material indicates that the solvent molecules captured in the pore were mostly removed, although slight weight-loss ( ⁇ 3%, probably due to H 2 O) was observed.

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US20130023402A1 (en) 2013-01-24
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